And samuel ii



(No Model.) v

T. OALVER 8?; S. H. STOUT.

' BALANCED SLIDE VALVE.

Patented July 10, 1883.,

UNITED STATES FFICEQa PATENT TIMOTHY CAL'VER, OF PORTSMOUTH, OHIO, ANDSAMUEL H. STOUT, OF

OOVINGTON,

KENTUCKY.

BALANCED SLIDE-VALVE.

SPECXFICATION forming part of Letters Patent No. 281,015, dated July 10,1883.

Application filed April 1 t, 1883. (No model.)

To all whom, it may concern Be itknown that we, TIMOTHY CALVER andSAMUEL H. STOUT, both citizens of the United States, and residents,respectively, of Portsmouth, Scioto county, State of Ohio, and ofOovington, in the county of Kenton and State of Kentucky, have inventedcertain new and useful Improvements in Balanced Slide- Valves, of whichthe following is a specification.

Our invention relates to improvements in I slide-valves.

The objects of our invention are, first, to provide duplicate valveswithin asteam-chest having a steam-supply opening from the boiler anddouble sets of supply and exhaust ports leading by a single set ofsupply and exhaust ports to and from the cylinder, said valves beingconnected by adjusting-screws for lateral wear adj ustment, and a yokefor receiving the end of the valve-stem to reciprocate them.

Another object of our invention is to provide tongues or ribs on theunder side of the valves, upon which tongues the valves slide todiminish, as much as possible, the friction of the valves on theirseats, and provide space for steam-pressure on said under side of thevalves to balance the pressure on their upper sides, and therebyconstitute a balanced slidevalve.

Other features of our invention will be fully set forth in the followingdescription of the accompanying drawings, in which Figure 1 is anelevation of the steanrchcst with the cap or lid removed to show ourimproved valve mechanism. Fig. 2 is a transverse sectional elevation online w m, Fig. 1. Fig. 3 is abroken longitudinal section on line it m,Fig. 2. Fig. 4 is abroken under side view of the steam-chest, showingthe steam supply and exhaust ports to and from the cylinder of theengine to which the steam-chest and its slide-valve are fitted.

A represents the steam-chest g, havine a livesteam-supply opening, A,leading from the boiler into the steam or valve chamber.

a a are live-steam ports constructed in duplicatein the opposite sides aa of the chest A.

b are exhaust-ports constructed intermediate the ports a u.

(8 (Z d are ports respectively connecting, by passages c c c, theseveral steam-ports a a b with the cylinder.

B B represent the valves, which are arranged in duplicate within thesteam-chamber, and are connected together by right and left threadedadjusting screws or rods 0, so as to be laterally adjustable and toprovide for the wear of the working parts.

C are nuts on screws 0 for turning them.

D is a yoke whose ends rest loosely in slots or openings made in theinner faces of the valves, so that they may slide for lateraladjustment. Yoke D connects the two valves, so that they willreciprocate in unison by means of the valve-rod E, whose inner end isattached to said yoke in any suitable manner.

F represents tongues or ribs constructed on the under side of bothvalves B. In thus narrowing the sliding surface of the valves on thefloor of the steam-cl1a1nber,the friction is materially diminishedbyreason of the diminution of weight, and the presence of steam on theunder side of the valves approximately balances the pressure on theirupper sides, which closely approach the inner face of the cover or lid,as shown in Fig. 2.

In employing two valves and two sets of steam induction and eductionports in the steam-chamber, the effect of the steam upon the valves isuni form, and it can be admitted to the cylinder and exhausted therefromin greater volume.

It will. be observed that as the bearing-surfaces of the valves B arecut away, as shown, the amount of wear will be greater; hence theimportance of the adj listing-screws in such construction.

We are aware that it is not new to spread the balanced valves by meansof adjustingscrews for the purpose of keeping them on their seats andcompensating for wear; but such is not our invention. We are also awarethat valves operating on opposite sides of a verti cal seat have beensecured to two frames adjustably connected by screw-bolts for adjustingthe valves to the valve-seat, and such is therefore not claimed by us.

We claim' 1. In combination with duplex slidevalves 2 V QSLOI-i cut awayto give a minimum bearing upon the ing said valves in relation to eachother, subseat right and left threaded bars or screws stantially asdescribed.

connecting said valves, and means for adjust- In testimony whereof Wehave hereunto set ing said screws to take up loss by Wear, sub ourhands. 5 stantially as described. 7

2. The combination, in a slide-valve, of the stealuehest A, havingdouble sets of supply and exhaust ports a a b and connecting-pas-Witnesses: sage ports 0 c 0 and d d d, the duplex valves ALOISWINTERBERGER, IO B, having tongueF, andmeans, CO, foradjust- J. W.BANNON.

